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    How the spatial correlation in adhesion properties influences the performance of secondary bonding of laminated composites

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    AA_how the spatial.pdf
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    2.021Mb
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    Description:
    Accepted manuscript
    Embargo End Date:
    2022-04-22
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    Type
    Article
    Authors
    Li, Xiaole
    Tao, Ran cc
    Yudhanto, Arief cc
    Lubineau, Gilles cc
    KAUST Department
    Composite and Heterogeneous Material Analysis and Simulation Laboratory (COHMAS)
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    OSR-2017-CRG6-3388.01
    Date
    2020-04-22
    Online Publication Date
    2020-04-22
    Print Publication Date
    2020-07
    Embargo End Date
    2022-04-22
    Submitted Date
    2020-03-08
    Permanent link to this record
    http://hdl.handle.net/10754/662612
    
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    Abstract
    Spatial heterogeneity of adhesion properties is known to result in bridging during debonding of secondary bonded composite joints. The ligaments that bridge both substrates have crack-arrest features and thus significantly enhance the fracture resistance of joints. We have investigated the effect of randomly distributed adhesion properties between the adhesive layer and each composite substrate in previous works; however, the spatial correlation of adhesion heterogeneity within or between the substrates and how it effects the failure of secondary bonded composites is still poorly understood. In this current work, we assume that the spatial heterogeneity of adhesion follows a log-normal distribution. The Napierian logarithm of interface toughness Gc and separating strength S can thus be described by a Gaussian Process. We investigate in detail the effect of spatial correlation both within each substrate and between opposite substrates. Finally, we predict the crack resistance of such joints with adhesives of different mechanical properties. We find that the failure strain of adhesives is important through varying the elongation of ligaments and thus the associated extra dissipated energy. This work represents the first critical step for designing tougher secondary bonded composite joints by triggering and controlling adhesive ligament bridging.
    Citation
    Li, X., Tao, R., Yudhanto, A., & Lubineau, G. (2020). How the spatial correlation in adhesion properties influences the performance of secondary bonding of laminated composites. International Journal of Solids and Structures. doi:10.1016/j.ijsolstr.2020.04.012
    Sponsors
    The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under award number OSR-2017-CRG6-3388.01.
    Publisher
    Elsevier BV
    Journal
    International Journal of Solids and Structures
    DOI
    10.1016/j.ijsolstr.2020.04.012
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0020768320301281
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.ijsolstr.2020.04.012
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program

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